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Microbial community compositions of the water phase and the surface biofilm of the four microcosms showing the relative abundance of the 35 most abundant operational taxonomic units (OTUs) on 97% similarity level in all four microcosms. Planktonic communities were analyzed at days 0, 259, 604, and 945 and the community of the water-bitumen interface (*) at day 945, only.
